Non-return valves



Nov. 27, 1956 E. H. sPEcK 2,771,901

NON-RETURN VALVES Filed April 15, 1953 2 Sheets-Sheet l Nov. 27, 19.56E. H. sPEcK 2,771,901

NON-RETURN VALVES Filed April 15, 1953 2 Sheets-Sheet 2 qui,

United States Patent() NoN-RETURN VALVES Eric Hardy Speck, Yeovil,England, assignor to Normalair Limited, Yeovil, England ApplicationApril 13, 1953, Serial No. 348,303

Claims. (Cl. IS7-269.5)

This invention relates to reversible non-return valves and particularly,though not exclusively, for use with high pressures and hightemperatures and has for its object to provide forms of such valves inwhich it is virtually impossible for jamming or sticking to occurbetween the valve proper and its associated seatings or for damage ofthe valve or seating to occur and which permit of substantially freeflow of fluid in one direction and no ow in the other but which can beset readily so as to prevent free flow in the first-mentioned directionwhilst permitting free flow in the opposite direction.

The invention consists in a reversible llap valve having features as setforth in the claims appended hereto.

Referring to the accompanying diagrammatic drawings:

Figure 1 is a side view of one convenient construction of non-returnvalve embodying the present invention.

Figure 2 is a plan view thereof.

Figure 3 is a vertical longitudinal sectional View thereof.

Figure 4 is a cross-sectional view on the line lV/IV of Figure 3.

Figure 5 is a cross-sectional view on the line V/V of Figure 3.

Figure 6 is an inverted plan view with one half cover removed.

Figure 7 is a cross-sectional view of a detail.

Figure 8 is a longitudinal section of a detail.

Figure 9 is a side view of the detail of Figure 8.

Figure l0 is a plan view of a modified construction.

Figure 1l is a side view thereof.

Figure l2 is a vertical longitudinal sectional view on the line XII/XIIof Figure 13.

Figure 13 is a cross-sectional view on the line XIV/ XIV of Figure 12.

In carrying the invention into elfect according to one convenient formillustrated by way of example in Figures 1 to 9, an approximatelycylindrical cast casing a is provided furnished at each end with anges band c, either V shaped for clamp attachment as shown or plain anges forbolting, and furnished with two opposed valve seatings d and e,preferably at an angle of approximately 15, an internal recess fand anopening g on the opposite side over which is bolted a dished detachablecover plate h.

The plate h is furnished with glanded bearings i, j supporting anoperating shaft k to which is attached, by means such as splines orrivets, a frame `l having at its other end bearings m and 1i supportinga ap member o which is free to swing through the frame on pivot pins pand q. The ap member o has two protrusions r and s which when the valveis in neutral position and the flap is free to swing, will strikeagainst cam-shaped stops t and u and prevent the flap from damaging theseatings d or e. The protuberances r, s also serve to limit the travelin the horizontal direction when the valve is set to operate as anon-return valve in either direction.

r'ice shaped depression w for engaging any one of tllieewedgeshapedstops 1, 2, 3 on' the casing a is mounted rigidly on the operating shaftk.

Alternatively the operating lever v may be furnished with locating meanscomprising a retractable plunger engaging in sockets in the casing a.

In operation, when the operating lever v is in a vertical position andits locating depression w engages the corresponding stop 2, the flapassembly l and d is held vertical as indicated in dotted lines in Figure3 and so allows fluid or liquid to flow freely in either direction pastthe flap. When the lever v is set to engage the side stop 1 as shown infull lines in Figure 3, the flap member o lies flat on the valve seatingd and is free to swing away from that seating on flow taking place inthe direction away from the seating as shown by arrow B in Figure 3,thus forming a non-return valve for flows in this direction.

Similarly, if the lever v is set to engage the side stop 3, the flapmember o will lie on the other seating e and is free to swing awaytherefrom on tlow taking place in a direction C away from that seating,thus forming a non-return valve for flows in this opposite direction C.

The flap member o cannot chafe or hammer either of its yseating surfacesd, e. When the lever v is moved away from positions l or 2, the valve ois raised olf the respective seating by means of the protuberzance s orx before bei-ng transferred and thereby possible damage of .fthe seatingis prevented.

In order to a-llow the ap member o to rest freely on either ot theiseatings d or e the frame 'bearings m and n are elongated as indicatedat M in Figure 9, and, as previously stated, the seatings d and e are atan angle of approximately 15 so as to `ensure that the ap member o willshut by gravity; if desired a spring may be introduced to assist theclosing of the flap member.

In carrying the invention into eiect according to a lslightly modiiied-arrangement illustrated in Figures l0 :to 13, the valve is similar inmost respects to that described above except that 'the opening g andcover plate h lare situated at one side of the casing a instead off atthe bottom end, the Icasing has a .bearing i formed in the side oppositethe opening g in the cover plate h which bearing carries one end of theoperating shaft k. The other end of the shaft is supported in a bearingj formed in the detachable cover h and the operating shaft k and frame lare formed in one unit.

Valves embodying the present invention have a wide application for useand can conveniently be used for 'ground testing of pressurised aircraftor for duct testing.

Iclaim:

l. A reversible flap valve comprising a casing, two opposed valveseatings in said casing, a valve member between said seatings, a rockingsupporting mem-ber encircling said valve member means for retaining saidsupporting member in a central position or into a position at eitherside of said position, said supporting member being so pivoted on sa'idcasing Ias to restrict said valve member to movemen'ts in a plane atright angles to the planes containing said seatings and means operable|from Ithe exterior of said casing for rocking said supporting memberinto any of said positions, a protuberance on both sides lof said valvemember adapted to coact with cam members adjacent to both seatingswhereby -before the valve member is transferred from one side to theother the valve member is raised olf its seating and the valve member isprevented from striking and damaging itself or the seatings when thevalve member is positioned in central position.

2. A flap valve a-s claimed in claim 1 wherein said valve member ispivoted on a frame constituting said lever rigid with said supportingmember izo-operating with 'Supporting memberj """"'"three'notcheson saidcasing" T' 3. A ap valve as clainied in claim 1 wherein said casing isfurnished on one side with an aperture closed References Cited fthe me0f thlS Patent bya detachable plate. f 5 UNITED STATES PATENTS -4. A a?valve es claumed 1n clarru 1 whereul said cas- 793,577 Frank June 27,1905 mg is furnished with at least one internal cavlty for ac- 1 020 022Burke Mar 12 1912 commodating the valve member when in open position.1:821992 Stevens' sep 8 1921 5. A Hap valve as `claimed in claim 1incorporating a

